Hi folks, i recently purchased a Spectrum 4-4-0 with DCC but can't seem to get it to smoke. I added a few drops down the stack and ran it for a few min. and didn't see anything. This is my first steam train in years so I'm not familiar with any differences that these new models may have (i.e. amount of time needed to heat up, how much fluid to add, is there an on/off switch, etc.)