Why do some presumably electric trolley powered trains smell like diesel?

My line is the Tobu-Tojo, which has electric lines and pantographs, which tells me it’s electrically powered. But those trains definitely smell like diesel exhaust at times. So which is it? Or a kind of hybrid electric/diesel?

EDIT: Apparently I can’t tell diesel from burning grease. Mystery solved!

8 comments
  1. I’m not familiar with that line as I don’t live near it, but I do know that some trains run on electric when there are lines available and change to diesel when the lines are gone. That’s what’s most likely happening. I guess you could call it hybrid, but saying it’s dual might me more accurate. What do I know? It’s six in the morning.

  2. You sure you’re not confusing that smell with the smell of heated grease that is used all over the train?

  3. You can definitely hear and feel it if you were riding in a diesel powered train. As the other poster said, probably the smell of grease.

  4. Perhaps you are noticing a “burning electronics” smell? It can happen when the connection to the overhead line isn’t clean and sometimes after braking.

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