Wheel chocks

Hi Dan. Do you happen to know the BR Cat Number for these?

 

Br Cat Numbers are :-

0041/129650

Wheel Scotch For Coaching And Other Stock Without Handle. Plain Finish.

0041/129655

Wheel Scotch For Locomotives And Multiple Units, RH With Handle. Plain Finish.

0041/129660

Wheel Scotch For Locomotives And Multiple Units, LH With Handle, Plain Finish.

Unipart catalogue can be found at https://www.unipartrail.com/catalogue.html

 

Thanks DR for your detailed response

 

Just to confuse things, chocks are referred to as 'TRIGS' at www.TrolleyMuseum.org
The origin is not known but may refer to the trigonometry required to calculate a triangle with a curved hypotenuse.

If it's any help for those making their own, I'd suggest:
A softer wood rather than a harder one - it's generally preferable to crush rather than ride up on.
Cut the curve as close as possible to the wheel radius - too shallow & the wheel will climb.
Don't paint the base - maximum friction is needed on the railhead.
We release the brakes & confirm that the car is secure.

The only Scotch we have around here is imported in bottles.......