41. A ground frame does not normally require any form of shelter since it is usually operated by traincrew and not permanently staffed. 42. Newton Abbot Goods signal box was provided at the north end, until 1926 when it was replaced by a ground frame . 43. A siding from the main line was laid in from a ground frame connection about a mile east of Stranraer Harbour Junction. 44. According to the tender, this involves a 1, 200 m long single-track connection, including two ground frames . 45. There are colour light signals located at Tywyn Wharf, operated from the Control Office and disc signals controlled from the ground frame . 46. The stop boards are fixed signals and a train may not be driven past without authority from the guard operating the ground frame . 47. Two crossovers operated from ground frames located at the station are used for shunting purposes when trains require access to the terminal sidings. 48. Westwood signal box was closed in 1933 and replaced by a 6 lever ground frame to control the sidings and crossing gate locks. 49. The track layout at Birkhill features a simple passing loop with two-lever ground frames at either end to control the points. 50. During this period, the ground frame was only usable as a refuge siding, and it was not possible to cross passenger trains.
