I imagine they used the same mold for all 3 as they are exactly the same shells and chassis. Could it also be possible that the chassis were originally from another train or trains that fit these perfectly so they used them instead of re-tooling?
I am thinking that the THomas Ultimate Set a Toys R Us exclusive may be the biggest set with 161 pieces but a lot of those pieces were Road Track where the set Set Jamble has, 154 piece Super Deluxe City Railway has all Tomy Blue track and no road pieces.
![[Image: s-l1d000.jpg]](https://i.postimg.cc/0KSVjnJW/s-l1d000.jpg)
I am thinking that the THomas Ultimate Set a Toys R Us exclusive may be the biggest set with 161 pieces but a lot of those pieces were Road Track where the set Set Jamble has, 154 piece Super Deluxe City Railway has all Tomy Blue track and no road pieces.
![[Image: super-smiley-emoticon.gif]](http://www.sherv.net/cm/emo/word/super-smiley-emoticon.gif)
![[-]](https://www.blueplastictracks.org/images/collapse.png)