Flashing Railroad Lights

Built this circuit but the one LED stays on approximately twice as long as the other. Tried another 555 timer but the same result.
I built this circuit this am. How can I slow down the flash rate?

Dear Dave
Vi forum your light circuit for the train, wanted to build the circuit, but not how, I ask please tell me as hacerlo.Yo live in Colombia and here it is very difficult to find help.
Very friendly for your kindness