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Good Day,

Lionel's Gantry Signal Bridge No. 452 uses the 153C Contactor to activate the signal...just like it's big brother No. 450 signal bridge.

As most Lionel operators know, the 153C is activated when the weight of the train passes over it.  Unfortunately, the 153C losses adjustment, and needs to be occasionally tweaked in order for it to function correctly.

Has anyone found a way to use insulated track sections to operate this accessory?  Would appreciate any suggestions you may have. 

Thank you!

Urbie

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You may use one insulated track block, (made with either one or more track sections) to activate a relay. The relay, depending upon how it's wired, can change the signal from red to green or green to red.

The relay is wired so that its coil is energized by the wheels of a passing train, and its transfer contacts (SPDT) energize the lamps.  If you use DC for the relay coil circuit, you can make a circuit that does not chatter, flicker or drop out when dirty wheels go by.

The 452 is essentially "half" of a 450, or equivalent to a 153 and more recent versions. There are three contacts in the base: one common and one for each of the two lamps.

https://www.tandem-associates....l_trains_452_acc.htm

Last edited by Arthur P. Bloom

You can create DC easily from an available AC source, taken off one of the ZW outputs, or you can use a 12 volt junk-pile wall wart from various small appliances or gadgets.

Altronix model RB1224 is an easy-to-use example of a relay. They are cheap and can usually be found on Ebay for less than ten bucks. A diode bridge (a dollar) and a filter capacitor (a few dollars) will be all you need.

https://www.altronix.com/products/RB1224

Last edited by Arthur P. Bloom

Thanks, again, for the suggestions.

When Lionel introduced some of their popular accessories in the 1950's there were instructions that showed how to use insulated track sections in place of the 145C contractor, but not the 153C's.   So using the parts in your post were not referenced in any of Lionel's instruction sheets or operating manuals.  Probably because they were not available. 

Steve.  Thanks, again, for the value added pointers.  After reading the information on the MRAPR -12V DPDT relay 8A relay, it appears no other components are necessary to operate the No. 452 Signal Bridge...just this relay.

I use O'Gauge tubular track, and modifying sections to insulated "block" use, is fairly straightforward.  Arthur P. Bloom suggested in his post that a diode bridge, and a filter capacitor would also be needed.  However, Arthur had recommended using a Altronix model RB1224 relay which may require the use of these additional components in order to operate the 452. 

Is that also your assessment?

@Urbie posted:

Steve.  Thanks, again, for the value added pointers.  After reading the information on the MRAPR -12V DPDT relay 8A relay, it appears no other components are necessary to operate the No. 452 Signal Bridge...just this relay.

I use O'Gauge tubular track, and modifying sections to insulated "block" use, is fairly straightforward.  Arthur P. Bloom suggested in his post that a diode bridge, and a filter capacitor would also be needed.  However, Arthur had recommended using a Altronix model RB1224 relay which may require the use of these additional components in order to operate the 452.

Is that also your assessment?

The Azatrax relay board contains a diode bridge and transient  (flyback) suppression to guard against the voltage spike when the coil field collapses.  The capacitor would smooth the DC and suppress electrical noise which might minimize relay chatter caused by the wheels completing the circuit on the insulated track section.  The purpose of the diode bridge is to convert AC to DC in order to drive the DC relay coil.

Subscribing to the KISS principle (Keep It Simple Sailor) if I understand your explanation correctly all that is needed to install the No. 452 signal bridge is the MRAPR -12V DPDT relay 8A.  Connecting to appropriate insulated track sections, and the correct common and power terminals to the ZW is all that is needed.

I hope I have this correct.  Thanks again.

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