A Main Track is a track that must not be occupied without a permission to do so. Other tracks are Secondary Track s.
Sidings can be Main or Secondary tracks.
A Station is a named location on the railroad, listed in the timetable. Dual Control Switches may be operated by hand locally but this is mostly done during CTC failures. Spring Switches are spring loaded in their normal position. Restricted Speed is a speed low enough to enable the train to stop in half the visible range, short of stop signal, other train, wrongly set switch or track defect. Normally limited to 15 or 20 mph, depending on the railroad.