Aero Monorail made in St Louis ,Mo circa 1934 . Cast aluminium car bodies. Stamped steel towers. Rail is split with insulated fiber strip in center . DC powered ...towers need adjustments to provide a more level route ..and bases firmly mounted to lessen passenger complaints. Till then passengers are encouraged to take Motrin prior to boarding.
Towers were designed for standard gauge to run below .
climb aboard for a ride at link below
https://www.youtube.com/watch?v=vubzoRKdTfE