Have a general store that we recently assembled a 130' foot train system for customers.  Our store is open 7 days a week and open for 14 hours per day.  I have purchased two bumblebee engines for our system and already the engines have given up the ghost.  I would like to purchase a higher quality, heavier duty engine that can withstand the hours of use.  Is there such an engine out there that can outlast the bumblebee?  Thanks in advance.  Kurt from Etna, Wyoming