Back in July when I resurrected my Mainline ex LMS 2P 4-4-0 I must have been very lucky because has the engine running perfectly smoothly. Since then attempts to run at slow speed have resulted in the engine stalling on a diamond crossing and worse still coming to an unexpected dead stop in out of the way non scenic sections of the layout. Peco Streamline Mini Diamond and Mainline ex LMS 2P   The diamond crossing provides the clue. Peco Insulfrog Short Diamond   The Mainline 2P only