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In the Railway Series, Oliver ran away to Sodor with Isabel, a coach that he could work a push-pull train with, and picked Toad up somewhere on the way. Thus he and Isabel were paired up for passenger working, whilst Toad, in gratitude to Douglas for rescuing them, went to work with him.

Most likely due to issues of sexism surrounding female coaches and male engines, although not helped by the need for another model and a lack of much development, Isabel was dropped from the TV series, and only Oliver and Toad were rescued. To retain the 'engine and his stock' theme, Toad became Oliver's van, and thus didn't transfer over to Douglas.

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