Abstract: A track system for a railway system includes a base plate configured to be supported on a railroad tie. The system also includes a drive rail and a guard rail. The drive rail includes a head portion, a web portion, and a base portion. The head portion is configured such that wheels of a train car used in the railway system roll thereon. The web portion connects the head portion and the base portion. The base portion is supported on the base plate. The guardrail includes a head portion, a web portion, and a base portion. The head portion of the guardrail is configured to contact the wheels to prevent the wheels from slipping off the drive rail. The web portion of the guardrail connects the head portion of the guardrail and the base portion of the guardrail. The base portion of the guardrail is retained in a support on the base plate.

Abstract: A track system for a railway system includes a base plate configured to be supported on a railroad tie. The system also includes a drive rail and a guard rail. The drive rail includes a head portion, a web portion, and a base portion. The head portion is configured such that wheels of a train car used in the railway system roll thereon. The web portion connects the head portion and the base portion. The base portion is supported on the base plate. The guardrail includes a head portion, a web portion, and a base portion. The head portion of the guardrail is configured to contact the wheels to prevent the wheels from slipping off the drive rail. The web portion of the guardrail connects the head portion of the guardrail and the base portion of the guardrail. The base portion of the guardrail is retained in a support on the base plate.

Abstract: A modular railway diamond crossing incorporates sets of acute and obtuse angle castings. The rail connections to the castings have a fine taper to minimize joint impacts. The castings are spaced apart with a combination of rails and cast blocks. The outside block is a tapered design that maintains the flangeway and holds the castings and rails together. The inside block comprises a tapered common center casting. This unit also maintains the flangeway and a longitudinal distance between the castings. The center casting is a common part to all such crossings regardless of the crossing angle.

Abstract: A guide rail support assembly includes a brace and a guide rail positioned on the brace. A hook device having a base and two hooks extending from the base and around the brace and secures the guide rail to the brace. The brace has no apertures such that the hooks extend completely around the brace without penetrating any portion of the brace. Adjustment shims are positioned adjacent the brace and a spring clip is mounted adjacent the base and the adjustment shims for securing the hook device to the brace.

Abstract: A guide rail support assembly includes a brace and a guide rail positioned on the brace. A hook device having a base and two hooks extending from the base and around the brace and secures the guide rail to the brace. The brace has no apertures such that the hooks extend completely around the brace without penetrating any portion of the brace. Adjustment shims are positioned adjacent the brace and a spring clip is mounted adjacent the base and the adjustment shims for securing the hook device to the brace.

Abstract: A modular railway diamond crossing incorporates sets of acute and obtuse angle castings. The rail connections to the castings have a fine taper to minimize joint impacts. The castings are spaced apart with a combination of rails and cast blocks. The outside block is a tapered design that maintains the flangeway and holds the castings and rails together. The inside block comprises a tapered common center casting. This unit also maintains the flangeway and a longitudinal distance between the castings. The center casting is a common part to all such crossings regardless of the crossing angle.

Abstract: A railway crossing has a plate with a pocket that defines a crossing angle for enabling one railway line to cross over another at virtually any angle. The pocket closely receives continuous long beams and divided beams. The pocket also has protrusions for restricting longitudinal horizontal movement of the beams. Each divided beam has three separate, discontinuous segments, including two outer segments and one inner segment. The segments are reversible such that the inner segments may be interchangeably positioned with each other, and the outer segments may be interchangeably positioned with each other. Fasteners secure the beams to the plate and resist both vertical movement and lateral horizontal movement. Each fastener has a wedge brace, a clip, and a wedge. The wedge prevents pull-apart of the plate and the beams due to thermal forces, mechanical forces, and surface discontinuities.

Abstract: The present invention provides a chemical mechanical polishing slurry for the planarization of shallow trench isolation structures and other integrated circuit structures. The chemical mechanical polishing slurry of this invention comprises small abrasive particles having a mean diameter of between about 2 and 30 nm and large abrasive particles having a mean diameter of between 2 and 10 times larger than the mean diameter of the small abrasive particles. In use, the chemical mechanical polishing slurry of this invention can also include viscosity additives and etchants.

Abstract: The present invention provides a chemical mechanical polishing method for the planarization of shallow trench isolation structure and other integrated circuit structures. The method of the invention comprises the steps of providing a substrate having a plurality of patterned regions and polishing the substrate with a chemical mechanical polishing slurry comprising small abrasive particles having a mean diameter of between about 2 and 30 nm and large abrasive particles having a mean diameter of between 2 and 10 times larger than the mean diameter of the small abrasive particles. The chemical mechanical polishing slurries can also include viscosity additives and etchants for use in the invention.

Abstract: A system for monitoring a limited number of operating conditions in a nuclear reactor and for graphically displaying same on a display device is disclosed. The system parameters selected are those which typically change as a result of a reactor trip. As long as these system parameters remain within a "post-trip window" on the graphic display, the power plant is operating normally. If, however, any of the foregoing system parameters falls outside this "window", this is an immediate indication to the power plant operator to institute the necessary procedures to remedy same. A sequential controller (26) is provided to continuously sequentially sample the foregoing operating parameters and to transmit data regarding same to the display device.

Abstract: A safety system (10) for shutting down a nuclear reactor under overload conditions is provided using a series of parallel-connected computer memory type look-up tables (14a, 14b, 14c, 14d, 14e) each of which receives data on a particular reactor parameter (P, T, .phi..sub.T, .phi..sub.B, W) and each of which has stored therein a precalculated functional value [f(P); f(T); F(.phi..sub.T); f(.phi..sub.B); f(W)] for that parameter indicative of the percentage of maximum reactor load that the parameter contributes. The various functional values [f(P); f(T); f(.phi..sub.T); f(.phi..sub.B); f(W)] corresponding to the actual measured parameters are added together to provide a control signal (S) used to shut down the reactor under overload conditions.