Hi! i have a scientific toys train set. i dont know wat the model number is, but its the Rio Grande train line model. i cant find the on switch to operate the train. the batteries go in the coal car, but theres no switch. please help!

https://www.ebay.com/itm/PIKO-Model-H0-HO-1-87-Scale-Train-Track-lost-parts-Lot/223441376758?hash=item340624d5f6:g:xbEAAOSwRG1cg5wr&frcectupt=true

I would suspect a bad switch or a bad motor.
These parts are not available anywhere that I have ever heard of.. You might go to the store you purchased it from and ask them.
God bless your efforts.

Polar Express only runs in reverse ' O Gauge Railroading ...

ogrforum.ogaugerr.com/topic/polar-express-only-runs-in-reverse

Dec 7, 2011 - Polar Express only runs in reverse ... At this time of the year all Polar Express trains are programmed to run North only. ... This would not be so bad on the Strasburg set because half the time, the prototype runs in reverse.

both trains only go backward - Classic Toy Trains Magazine

cs.trains.com > ... > Forums > Toy train operating and collecting

... trains that i set up around Christmas. The first train, according to the box, is a k-line 0/027 gauge dual motor mp-15. For a long time it has only run backwards.

no forward only reverse - Model Train Forum - the complete model ...

www.modeltrainforum.com > Scale Specific Model Train Forum > O Scale

Oct 18, 2009 - 10 posts - ‎3 authors
There are two switches under the cab; they have no effect on forward motion. This setis 2 or 3 years old and has been run maybe 1 hour total. New Athearn HO Locomotive won't go in reverse ...
9 posts
Mar 5, 2015
Lionel Rio Grande 8213 only runs in reverse - Model ...
10 posts
Nov 18, 2013
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I need more info--info supplied it's to vague but give this a shot.
https://www.google.com/search?q=Toys+train+sets+Union+Pacific+Cars&rlz=1C1NHXL_enUS713US714&oq=Toys+train+sets+Union+Pacific+Cars&aqs=chrome..69i57.13462j0j9&sourceid=chrome&ie=UTF-8#q=info+on+toy+train+tracks+types+for+union+pacific+cars

Look for a small opening with little white tabs that can be moved up and down, on both the train and the remote. All the tabs must be in the same position. ( Same thing on a garage door opener.)
If that's not it, make sure the batteries are in correctly in both items, reversed batteries will run lites and such, but not remote controls.

A train hobby shop can fix that.

**** u!!!

Try turning the bell on the Engine train behind the smoke stack.

HOLD TWO PIECES OF TRACK TOGETHER SNAP ONE SIDE TOGETHER THEN SNAP OTHER SIDE.

WELL WHERE EVER YOU BOUT IT FROM YOU SHOULD TRY TAKING IT BACK THERE AND GETTING THEM TO LOOK AT IT,TAKE IT TO THE SHOP,OR BUY A NEW ONE. :)