FCC can use any of platforms 1-3, which are all electrified and all bi-directional. Platform 4 is used by Northbound MML trains only, and is not electrified. Southbound stopping MMLs will also use any of the 3 main platforms, with none stop trains using the station avoiding Up Fast, between P3 and P4 (which is what the 66 is on). Northbound MMLs also used to use P1-3, with the Down Fast also being an avoiding line, but with the introduction of the Turbostars and the increase in MML services stopping at Bedford, and also those running through none stop, P4 was built next to the Down Fast, preventing the need for 2 conflicting movements over the Up Fast (one at the south and one at the north of the station). Up trains have it easier, since they don't really conflict at the north of the station, since the slow lines north of Bedford don't see that much use, and at the south end, the slow lines are bi-directionally signalled from the station to Bedford South Junction where MMLs regain the Up Fast, so could use P3 without conflicting with P1 and P2, or P2 without conflicting with P1. Trains to and from the stabling siding to the north need to use P1. The Bay is only used by the Bedford to Blethley line, but is electrified and can be used as a headshunt from the sidings for a 4 car EMU.