I just started playing the scenario Iceberg Islands in original RCT1 with OpenRCT2.
I encounter 2 bugs with the chairlift:
1. I couldn't change the number of cars in the Chairlift and make it more. If I change it, it would always make it 1 car only.
2. From time to time, the first journey will count 4 times longer as the original travelling time, resulting in a huge penalty of excitement rating (that too much underground time for transport ride) and reduced to around 0.6.