Dusk Railway is basically an "enjo kousai" or compensated dating simulator wherein the heroine is basically a high school prostitute who is trying to make ends meet using her body.
Not exactly the most original of motives, but it does happen iRL so who am I to judge.
Gameplay - it's simple enough, whenever you select a client, multiple things are highlighted under their offers sometimes, showing how they do things, what they don't like or in some cases, they don't want straight up sex.
One thing you will have to manage though is your HP and SP, of both which are depleted every time you do the deed (except for the Cameraman status). You also need to manage your pregnancy meter, otherwise you risk a game over via preggers.
Music - it's servicable, nothing noteworthy, moving on
Graphics - it does the job, the girl looks pretty, the animations are decent enough, again, nothing mind blowing.
Overall, it's just an average game for me. Getting the endings requires some experimentation to get (like the Despair Ending), but maintaining your cash flow is laughably easy that it's almost impossible to lose unless you're doing it on purpose. The game also doesn't seem to have a time limit as I passed 100+ days are there seems to be no consequences whatsoever.
So yeah, 3 stars outta 5 for me.