Palitoy Log Delivery Train Set

[Super]

you can see the blue tanker up close.

Ah...a 'Stubby' tanker...so this is where it comes from? I see you can tell this is an old set by the hook end of the coupling design.

If I remember correctly, there are multiple colored 'Stubby' tankers, the more plentiful yellow one, this harder to find blue one and 2 other colors that do not come to mind quickly. Red and green possibly?