Abstract: A heat exchanger (100) for an exhaust gas recirculation system includes one or more rigid tubes (103), each having one or more internal cooling fins (111) that act as heat exchange surfaces to transfer heat from a gas to the walls of the rigid tubes. The rigid tubes are cooled by a liquid coolant contained within an outer jacket (113) surrounding the tubes. The rigid tubes may be straight and smooth, and may be alternated with one or more bellows sections (108, 104) which provide flexibility to the heat exchanger.

Abstract: A rail junction assembly (10) comprises a fixed rail portion (12) and a movable switch rail portion (14). The fixed rail portion (12) having a transfer region (26) which can be engaged by the switch rail portion (14) to effect transfer of a rail vehicle between the fixed and switch rail portions (12, 14). The switch rail portion (14) has an end region (28) movable into engagement with the transfer region (26) of the fixed rail portion (12). The transfer region (26) of the fixed rail portion (12) comprises an embedded rail portion embedded within an embedment (16).

Abstract: An improved heat exchanger suitable for use as a pre-cooler in an internal combustion engine exhaust gas recirculation system includes an inner heat exchange tube for exchanging heat between a gas and a coolant. A tubular outer body surrounds at least part of the inner heat exchange tube. Coolant flows through a cavity formed between the outer surface of the inner heat exchange tube and the inner surface of the tubular outer body, cooling the gas flowing through the inner heat exchange tube. The inner heat exchange tube surrounds a rolled, cylindrically-shaped corrugated sheet of material forming a plurality of fins. At least one of the fins is in contact with an inner surface of the inner heat exchange tube. The tubular outer body surrounds two or more inner heat exchange tubes, each inner heat exchange tube surrounding a respective plurality of fins.

Abstract: An improved heat exchanger suitable for use as a pre cooler in an internal combustion engine exhaust gas recirculation system comprises an inner heat exchange tube for exchanging heat between said gas and said liquid coolant. A tubular outer body may surround at least part of the inner heat exchange tube. Liquid coolant may flow through a cavity formed between the outer surface of the inner heat exchange tube and the inner surface of the tubular outer body, cooling gas flowing through the inner heat exchange tube. The inner heat exchange tube may surround a substantially cylindrical corrugated sheet of material forming a plurality of fins. At least one of the fins may be in contact with an inner surface of the inner heat exchange tube. The tubular outer body may surround two or more inner heat exchange tubes, each inner heat exchange tube surrounding a respective plurality of fins.

Abstract: A heat exchanger (100) suitable for use as a pre cooler in an internal combustion engine exhaust gas recirculation system comprises one or a plurality of rigid tubes (103), each having one or more internal cooling fins (111) to act as heat exchange surfaces to transfer heat from a gas to the walls of the rigid tubes. The rigid tubes are cooled by a liquid coolant surrounding the tubes and contained within an outer jacket (113) surrounding said tubes. The rigid tubes may be straight and smooth, and may be alternated with one or a plurality of bellows sections (108, 104) which provide flexibility to the heat exchanger.

Abstract: A rail junction assembly (10) for directing first and second rail vehicle wheels (42, 44) of a wheel arrangement (40) is disclosed. The rail junction assembly comprises first and second main rails (12, 14) and first and second switch rails (16, 18). A first flange receiving passage (17) is defined between the first switch rail and the first main rail. A second flange receiving passage (19) is defined between the second switch rail and the second main rail. The first flange receiving passage is configured to receive a flange (48) of the first wheel, and the second flange receiving passage is configured to receive a flange (48) of the second wheel. A wheel control arrangement (30) controls the first wheel on the first main rail when the second flange is received in the second flange receiving passage, and controls the second wheel on with the second main rail when the first flange is received in the first flange receiving passage.

Abstract: A rail track arrangement has a rail, a sheath or shell which receives the rail and a resilient layer between the sheath and the rail. The sheath has mounting points at an upper surface of each side of the sheath, and upper side portions of the resilient layer extends laterally over the mounting points at each side of the sheath and engage with the mounting points. The upper surface mounting points for the sheath can be used for positioning of the sheath, and enable the sheath to be grouted into position in a one stage process. The mounting points enable the sheath to be installed without the rail, with high accuracy.

Abstract: An exhaust gas re-circulation cooler device comprises at least one cooling plate, said cooling plate comprising an upper plate wall and a lower plate wall; said upper and lower plate walls defining a plurality of gas passages which have a gas inlet at a first end of cooling plate and a gas outlet at said first end of said cooling plate; each said passage directing a gas flow between said inlet and said outlet and along a length of said plate; and said plate being sealed so as to be gas tight along a length of said plate, and at a second end of said plate.

Abstract: There is provided a gas heat exchanger 101 comprising a coolant conduit 102 having a coolant inlet 103 and a coolant outlet 104, a gas cooling conduit 201, and a gas bypass conduit 203. At least a portion of the gas cooling conduit 201 is disposed between at least a portion of the coolant conduit 102 and a portion of the bypass conduit 203. During a first mode of operation, the gas cooling conduit 201 is configured to carry gas. During a second mode of operation, the bypass conduit 203 is configured to carry gas and the gas cooling conduit 201 is configured to reduce a heat exchange between the coolant conduit 102 and the bypass conduit 203.

Abstract: One aspect of the invention provides a rail arrangement in which a rail is releasably supported in an inner shell, and the inner shell and rail are received within an outer shell. This provides flexibility in that the design of the inner shell can be varied to provide different relative positioning of the rail with respect to the outer shell. Thus, the inner shell can be used to take account of sinking of the outer shell, which is typically cast into the rail foundations.

Abstract: A railway or tramway rail fastening system includes a shell (2) and a resilient fill (4) within the shell for holding a rail (1), the shell having an inner profile open channel form to receive the rail, the inner profile being shaped to hold firmly, through the fill (4), the head and base region and/or an intermediate portion of the rail. The arrangement is such that pinch points are produced which hold the rail in place.

Abstract: A flat weed guard cover system is presented which has at least two pieces. Each separate cover has a cut-out section and one or more flaps near the cut-out section. In use, a first weed guard cover is placed around a vertical structure with the structure protruding through the cut-out section and the flaps surrounding the vertical structure. A second cover section is then placed over the first with the vertical structure again protruding through the cut-out section of the second cover and the flaps of the second cover on top of the flaps of the first cover. The flaps may be sealed together by Epoxy glue or any other suitable manner. The edges of the cover may be secured to the ground by means of landscape staples. Different geometric shapes and different positions for the cut-out are also presented. The covers inhibit growth of weeds or other plant material around the vertical structure.

Abstract: A compacting apparatus is provided and includes a material supply line having an upright inlet portion and a transversely disposed lower outlet portion provided with a discharge opening at its discharge end. The lower outlet portion is supplied with high pressure air from an air supply line which includes an outlet end portion disposed coaxially within the lower outlet portion of the material supply line and is provided with a nozzle assembly for directing pressurized jets of air toward the discharge opening.