Only took several months to diagnose this problem!
A few engines would periodically stop on this bridge.
Since a 'ton' of engines run on it, I thought, maybe, dirt; nada.
I only use rail joiners on hidden track or on some old Tru-scale roadbed.
One train was consistently stopping on the bridge (weird how other engines have no problems!)
I used my 'power checker' and saw the track was 'loosing' power; also, the circuit breakers were not 'shorting'.
I spiked the rail joiners and 'problem solved'!
For some reason this set of diesels would cause an interruption in the rail joiner.
This engine was not 'smoking' last night.
Had way too much smoke fluid in the reservoir.
After some of the fluid 'burned off', it smokes well!
Tru-scale made turnouts where the frogs closed:
