A passenger train transports passengers between two stations located in two separate cities. On a particular day, the train carried 80 passengers from one station to the other one way, and on the return trip carried 50 passengers. If the train made three more round trips that day, taking the same number of people as the first trip in each trip, calculate the total number of passengers transported between both stations that day. Let's think step by step and output the final answer within \boxed{}.
user