The 4F is an unknown scratchbuild in brass, bought it off ebay and was most impressed as looks right.
Track is peco pointwork with 3mm society track bases for the flexible, all code 75 and surprisingly the triang runs on it very well. Just had to widen the checkrails as some were a little tight and set all the back to backs.
Comparison with BEC 4F, proper handrails and good detail, fits the standard chassis well enough
Different tender, unknown model but very nicely made
Most obvious from the front, has a great NER look to the boiler, but given the difference between this model and the standard 4F I have decided that the BEC kits can be 3Fs with the narrow boiler.
Next project, convert a BEC 4F into a SR Q class, just need a different cab, same trick as done with vintage Lima 0 gauge models and should look passable enough.