Being independent is not being afraid to ask for help. There are Blue Disabled Person Signs with arrows pointing to where the entrances, exits, ramps and elevators are to the train stations.
When the train arrives at the station, go to doors where the Blue Disabled Person Sign is. On some trains it might be in the middle of the train car. Other cars might have the Blue Disabled Person Sign on each end of the car, by the doors. Go to the door where you want to board the car, wait until the doors open and the passengers deboard the train. Please note that the train car might not be level with the platform. I have found that it is a little bit easier, safer to enter the train car on a little diagonally, just so that both of the front wheels of your electric wheelchair do not get stuck in the space between the platform and the train car, this also applies to manual wheelchairs.. There is sometimes about 1 inch to 3 inches of space between the platform and train car. A person walking without any mobility aides would not have any trouble stepping over the space between the platform and train car. A person using any type of mobility aides, cane, crutches or a walker would have to be very careful. After you have boarded the train car in your electric wheelchair, proceed to the wheelchair area of the train car, place your electric wheelchair in a comfortable place, turn off the power, sit back relax and enjoy the ride. There are signs on board the train that show where the wheelchair area is.
Arriving at your destination.
If you feel comfortable doing so, you might want to start moving slowly close to the doors so when the train arrives at your destination station and the doors open you can be one of the first passengers to deboard the train. Please remember that the platform might not be level with the floor of the car you are deboarding.
My first trip using public transportation I had a friend go with me. All we did was spend a day riding around on different transit buses and trains getting on and off them, just so that I could be comfortable doing this on my own.