Devin Christenlall, left, a Schenectady High School student in the Explainer's Program at miSci, talks with children about the model train operating during the December Break Week STEM Classes at miSci, Museum of Innovation and Science on Thursday, Dec. 28, 2017, in Schenectady, N.Y. On every Saturday through Jan. 13th, from 10:00am to 12 noon and from 1:00pm to 3:00pm, the GE Trip Optimizer, a train engineering simulator, will be available for children to operate. The simulator gives those using it the feeling of operating a locomotive. (Paul Buckowski / Times Union)