Abstract: A cabin construction comprises a main cabin and an extension cabin telescopingly received in an open end of the main cabin. A first guide arrangement glidably carries and guides the extension cabin for telescoping movement in relation to the main cabin and includes a cable line having two portions respectively extending in vertical planes parallel to the cabin side walls and a pair of superposed pulleys mounted near each side wall of the extension cabin near an open end thereof, each cable line portion being trained over a respective pair of pulleys in zigzag arrangement. A second guide arrangement guides the extension cabin parallel to the main cabin and includes a cable line having two portions extending horizontally parallel to the floor and roof, and two pairs of pulleys mounted on one wall of the extension cabin, the pulleys of each pair being arranged symmetrically with respect to the longitudinal axis and each cable line portion being trained over a respective pair of the pulleys in zigzag arrangement.