... hasten to add that this road was not intended to be used by passenger stock but in the interests of scientific experiment!!!! Tony. posted: 25 Apr 2012 16:48 from: allanferguson Nigel Brown wrote: For coupled coaches and the like it depends to some extent on what couplings you are using and where they are mounted; esssentially, how much sideways shift you can get between the couplings. I use body-mounted B&B couplings, and find a B7 is just about OK. Cheers Nigel 176_251139_320000000.jpg I'm not sure whether this scan will be readable -- it is a poor quality original. It relates the possibility of buffer locking to the radius of the reverse curves and in particular the length of the intervening straight. I don't know where it came from, and I certainly don't understand the maths. I haven't made any use of it as my interests focus on much older and much shorter rolling stock. Obviously it only relates to pushing stock. Allan F posted: 25 Apr 2012 16:52 from: allanferguson ...