After waiting two hours for ProTech towing from Waltham, I decided to call another towing company. They came within 30 minutes. I hitched a ride with the tow truck driver to the closest auto repair shop, Doherty's Garage. Towing costs were outrageous: it cost me $85 to be towed 4 miles (I definitely need to get AAA).
After dropping the truck off, I walked to the Lincoln train stop (literally 100 feet away) and took the 3:59 train to Boston. I got off at the Porter Square stop and took the Red Line to Central Square. Total cost to get back to the office: $7.45.
Since Doherty's is such a small garage, they're not open today (the 4th of July) nor on the weekends. So they won't even get to my truck until sometime early next week. It looks like I'll be without a truck until middle to end of next week. I guess I could always use my legs for transportation.