The cost of tour Myanmar government transports in Myanmar is all in us dollars. If you are going on a trip with train from Yangon to Mandalay you have to pay in US dollars. Sometime you are not able to travel with the private Myanmar transports so you have to take the government (
boat & trains) except you are going on a private Taxi tour Myanmar. The price will be far more expensive compare to Myanmar local rate even though it is operated by Myanmar government. Tour Myanmar with government transport cost is all in US dollars as Myanmar government only accept dollars as tour Myanmar income from Foreigners.
Myanmar Flight, train, boat and all government transportation charge tourist in Dollar or FEC (Myanmar dollars) as tour Myanmar income. The prices will be different on conduction depend on the authorities in Myanmar. Sometimes it is cheaper than normal price but you can't bargain. Your trip may take longer if you are taking tour government transport your entire journey in Myanmar.