Unbelievable price for this respray.
https://www.ebay.co.uk/itm/Murphy-Model-Northern-Ireland-Railways-3-car-DMU/263737511502?hash=item3d67fb0e4e:g:VwUAAOSwbA5bFa~X
I think the old Peco ST242 and ST243 might do the job. They equate to a crossover between radius 1 and 2 and can be found on ebay at present. Hope this helps.
Just picked up one this week to see how it would operate. Very easy to set up and very easy to use. Simply attach to the rails, activate with a wire, supply an accessory address and start to use.