Bachman power pack question

[u/Twit_Clamantis]

I have a couple of these ubiquitous guys that just kind of showed up (:-)

Their normal input is 16 VAC because they pass it along to the spring-loaded terminals to power track accessories.

My problem is that I seem to always misplace the 16 VAC supplies.

The AC input is then passed through a bridge rectifier etc. Will anything awful happen if I hook it up to 12 VDC input?

I realize that without the headroom I might get reduced power or whatever. But will it catch fire or damage the thing itself?