Sheldon attempts to repair a diesel engine that is supposed to be from a locomotive. However, the engine shown is far too small and is the size of an engine more appropriate for a truck, bus, or boat. A diesel engine from a locomotive would be 3-4 times larger than the one shown.
The diesel engine Sheldon works on is a Detroit Diesel model 6V-71T, which weighs 2,380 pounds and is chained to a shipping pallet. Sheldon says that he paid two men to move it up the many flights of stairs to his apartment, but this would have been physically impossible.
When Bernadette answers her phone the lock screen is displayed. If she was in a call the contact details would be displayed.
Sheldon, who is portrayed to possess great knowledge and passion for trains, does not seem to know what a manifold (part he confuses with a fuel pump) is or where the turbo (confuses it with the crank shaft) is located.