Go!SMTD is a mobile ticketing application for Sangamon Mass Transit District in the city of Springfield, Illinois. The Go!SMTD app makes it easy to plan your trip and pay your bus fare with your mobile device. Theres no need to carry cash and change or worry about losing a temporary pass. Purchase additional passes or add value to your account anytime with a debit or credit card. When you board, activate your pass and scan your phone screen on the bus farebox.