Okay,
I've made a few changes (without jcqh's permission, gonna ask him
later, in the day, because it's late now) to the C651.
Firstly, you can take two hours to complete your journey.
Secondly,
I've modified the motor sounds a little, but I'm still missing some
motor sounds to make it really perfect, but it's more closer to
realism now.
Thirdly, you can enter and exit the train network only once in a
journey.
Fourthly,
I've made the acceleration and deceleration speed a little weaker,
with some help from SBS7322B.
Lastly, Senior Citizens can enjoy concession fares only when the
journey starts after 9am.
To make it simpler for you, cross out the first, third and last
point.