A train stop loop is provided at each stop board, and is normally activated ( so that any train attempting to pass it will be immediately brought to a halt ).
2.
In summer, the first Zion Canyon shuttle leaves the visitor center at 5 : 45 a . m .; the last return bus from Temple of Sinawava, the northernmost stop, leaves at 11 p . m . The entire eight-stop loop takes 90 minutes.