That must be regional. In the northern Virginia area there are quite a few bus routes, as part of the Metro system which also runs the subway trains. In many areas there are Connecter bus routes that connect other routes, or go where they don't. Also several companies run commuter buses to and from the suburbs to different areas, such as Washington, DC, or other job heave areas. Washington, DC, even had a short trolley system, with the possibility of expanding it. As I understand it, Woodbridge, VA, has a bus system that will take you wherever in its covered area you want to go. It will also pick you up. They have bus stops, but then take you other places. There is a Virginia Railway Express, from Richmond, VA to Washington, DC, with a spur to/from Manassas. It's mostly a commuter system, but as I understand, it does make runs throughout the day. AMTRAK is like all railway lines. Not meant to service the public reliably or inexpensively. I once wanted to take a trip to near Louisville, KY. By train it would have taken about 2 1/2 days, being routed through Chicago and down to Arkansas then back to Louisville. The bus was not as comfortable, but OK. It also took less than 24 hours.
EDIT: We also have an unusual system called slugging. People queue up at different places and wait for cars to stop by and pick them up. Many are set up by counties, and provide lots of free parking for slugs. So, from where I live, I can pick up two slugs and therefore have three people in my car. That allows me to travel in an HOV (High Occupancy Vehicle) lane, which is a special lane reserved for vehicles of three or more people. In my case, I take them to the Pentagon and drop them off. Some may work there, the rest take the subway or a bus to downtown DC to wherever, or close to, their work location. The unwashed masses must travel in the 'mainline' lanes which are mostly pretty crowded and therefore slower, and more difficult to navigate/maneuver in. There are locations in DC where people queue up, and I pick them up there and take them to one of the county slug lots.
A recent innovation is a company in Australia that tracks vehicles by a module that mounts on the inside of the windshield. It is switched to say I have three people, or that I do not. If I have three, I travel for free. If I don't, I must pay into an account that accepts the fees for the company. Also, the fees are variable, depending on the amount of traffic in the mainline lanes. The company is supposed to maintain the billing towers, signage, and highway. I am sure they will do a fine job for the next 50 years. They have already been caught with some questionable billing practices, that I think they have been forced to discontinue. If you were caught traveling without the module, you would be fined. If you didn't pay it immediately, and especially if you ignored it, they would wait for a while and the suddenly send a bill for thousands of dollars in interest. I don't understand everything I know about all that. My taxes don't seem to have gone down either.