That relay is not useful if you need a NC contact. It has two coil terminals, and two form A terminals. Whether it's AC or DC coil is not indicated. If there's a label stating the coil voltage, we can't see it.
(Form A = mAke, or NO. Form B = Break, or NC. Form C = one A and one B with a common, or "single pole, double throw.")
If you search on this forum for the term "relays" you will find dozens of messages recommending the exact relays to use in electric train applications.
Many of us here are very familiar with the various types and applications.
My personal recommendation is to use the 6/12/24 volt DPDT relays sold by the Altronix company. They are mounted on printed circuit boards and use screw terminals for their connections. Google "Altronix relay RB5" for instance.
Creating a DC bus on your layout and using these relays provides a very efficient system. There are members of this forum who create and sell relays already ready to accept either AC or DC and which will pretty be applicable to anything that you would need to do on a layout.
