Seeking source for siding on/off switches

Grainger has spring loaded Hold Down to Activate buttons. John

Go to All Electronics and shop or just go to this handheld push button ON OFF.

Handheld

SPST PUSHBUTTON, PUSH ON/PUSH OFF
CAT # PB-13
SPST PUSHBUTTON, PUSH ON/PUSH OFF
$1.85 each

Susan, I will order a handful of those.  They are perfect and highly affordable.  Thank you.

They also offer a rubber boot cap that screws onto the top of the switch and will keep dirt and any possible spilled drink from getting into it.  No PN, just 'rubber boot cap for PB-13'.

How do you figure that those pushbuttons are "hand held?"

They have threaded shafts and mounting nuts, and are intended to be mounted in a panel, just like hundreds of other similar devices.

From the catalog description:  "Black body, actuator and panel nut."

You could use the Lionel 390 or the smaller Lionel accessory activation switch.

The Lionel switches are clearly better, but also more expensive by an order of magnitude.

The All Electronics switches, while clearly intended to be mounted in a box, appear in the picture to feature a small plastic enclosure as well.  The connections can be made safely under a shrink tube at the end of the little pigtail.  There are no exposed metal tabs like most switches have.

As a side note, while I was working on this, I realized that I have some pieces of Fastrack from a starter set (the 10" power plug track and a 10" plug and play accessory track) with lights built into them that I could use to indicate whether a particular section of track was powered up.  Extremely convenient alternative use for these parts!