zentralbahn 2nd class coach B 322-8 in an IR train Interlaken - Luzern. With their automatic couplers (including pneumatic connection for the compressed air brake), electric power cable and control cable for doors and push-pull trains, they look considerably less cluttered than mgb/RhB rolling stock. Note the red/white end of train signal, something that has been eliminated by a number of other narrow gauge lines but is still used on the zb. Interlaken Ost, 2011-09-30.