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Taking mass transit is great. But when you step off your train or bus, what do you do to get to your final destination? Increasingly, that means BYO wheels: a bike, e-bike or scooter.

The problem is the rules for bringing your "wheels" are much different depending on your carrier.

METRO-NORTH: You can bring your non-electric-powered bike on the train anytime except rush-hour. Some cars include wall-mounted racks; check TrainTime for bike-friendly trains and car markings. If you have a folding bike that can stow in the overhead rack, you can bring it anytime.

But if your bike or scooter is powered, the rules are quite different.

First, you can't ride your e-whatever at the station, on the platform or in the train. You can only bring your wheels on the train if it folds up, weighs less than 100 pounds and is your property, i.e. not a CitiBike, VEO etc.

You cannot charge your e-bike on the train. It must have UL-certified batteries and be stored in an area so it doesn't block other passengers. Whatever the rules may be, the train conductor or railroad staffer always has the final say and can stop you and your bike from being on the train.

Remember... if your final destination is Grand Central Terminal there are any number of Citi Bike stations just outside on the street. At New Haven there are bike-shares available through Ride New Haven.

SHORE LINE EAST and HARTFORD LINE: The e-bike rules here are quite similar. Unlike on Metro-North, regular (non-electric) bicycles are welcome anytime. On the Harford Line, CT Rail trains welcome bikes anytime for free. But Amtrak Hartford Line trains accept bikes only with a reservation and a charge of $20. All e-bikes with lithium-ion batteries are banned on all trains on the line.

At Hartford's Union Station you can rent a scooter (but no bikes) through VEO. Bikes may be added in the future.

CT TRANSIT BUSES: Connecticut's buses were pioneers in allowing bikes... not on the bus, but on racks mounted on the front of the bus. The racks only hold two bikes, and its first-come, first-carried.

Only standard non-motorized bikes are allowed on racks; e-bikes, scooters, and motorized vehicles are not permitted, regardless of weight.

OTHER BUSES IN CONNECTICUT: All GBTA (Greater Bridgeport) buses are equipped to carry your bicycle... two-bike maximum, first-come first-served. Norwalk Transit rules aren't crystal clear. You might want to consult your carrier's website or ask the driver before trying to transport your device.

PORT JEFFERSON FERRY: The Port Jefferson Ferry allows bicycles and e-bikes onboard, but according to company policy, they are considered luggage and must be kept with the rider at all times. Cyclists are required to carry their bikes as well as any baggage up and down staircases to the passenger decks. If there's room you can use the elevator.

Whatever your destination, always BYO (and wear) a helmet when operating on two wheels. And remember: E-bikes and scooters should use UL-certified batteries and never be charged aboard any vehicle or station.