Any advice.....

Assuming you have the 6-2154(it looks like you transposed two numbers),



you could do it the Marx way:

Or you could segment the ground rail of any straight or curved section of track by cutting with a Dremel wheel and reassembling wthe rail with fiber pins... the basics can be found here(Marx discussion, but works with the 154 too...):

Triggering Marx Signals

Here is a good close-up of the contactor for reference(from Jeff Kane - The Train Tender):

And here is how I do it with O-27(the binding post on the right is connected to fixed voltage):

Also, check out this discussion on Realistic Flashing for a 154 Crossing to use the 154 with a regular insulated rail section.

Thanks for posting this!  Kudos to Rob again!  I'm putting the finishing touches on my new layout's accessories and decided to add some of my Dad's old childhood Marx accessories. 1940s vintage highway flasher, couple others. 

This link shows how to do what you want with Fasttrack, but the principles are the same for tubular.  Very similar to what's illustrated in Rob's last photograph above.

Any trackside accessory can also be operated by magnetic sensors as well as IR detectors and insulated rail sections. Sometimes this is a better way to go.

thank you for the reply. doing it the Marx way, I`m confused about the rail clips. how are they attached to track and what do they look like.

thank you