Caley739

In the 1950s the 2 overnight trains Euston to Perth were worked by Crewe North engines and men between Crewe and Perth. The engines would lay over at Perth until their return south on overnight trains. Perhaps unsurprisingly Perth running foremen were tempted to use these engines on their long layover on fill in jobs to Glasgow or Aberdeen.My understanding is that the LMR did not approve of this practice because the softer Scottish coal available at Perth had a lower calorific value than the Staffordshire hard coal available at Crewe.