Then, of course, is the island platform! - In the days of the 'Walkman' cassette player, they were bi-directional. When they got to the end of the tape, the mechanism reversed, repositioned the head, and played the 'other side' going backwards - ad infinitum, or until it was switched off or the battery died! - Going off-topic - the convention for playing records was a clockwise rotation, starting at the outer edge, but cd/dvd's start in the middle and work outwards! I'm not sure which way they rotate, as they are hidden in little slots! - Anyway - to drag this back onto almost topic, with DCC forwards is the direction the loco is facing, irrespective of which way you set the controls. If your loco goes forwards right to left, you stop it, physically rotate it 180', and set it off again, it still goes forwards, but left to right!