Number One Dungeon Supplier

To use modern high speed trains for all destinations, Jin can merely copy every other modern city subway train station blueprint. Not to mention, they were easy to find as well. Mainly because the System is able to get its hands on the latest designs from the databases. 

Not to mention, it is efficient in terms of design which the System likes due to having people just go to whichever platform they need to go. Unlike the Waterloo train hub, people have to wait for the train to depart until it's out of sight then the next train will arrive. 

For now, it's not too bad because of the number of service and dungeon instances that Dungeons and Pandas had but it would be a pain in the butt for Jin in the future if he were to add even more. Also, the System consistently creates new landscapes for the users to see under in the subway station, all they have to handle is the darkness of the tunnels.

In addition, the System noted that when most of the cultivators had seen the scenery once, they didn't bother to look at it again as about 90% of them were all looking at their phones once they had taken the picture. Otherwise, they were all looking for information, messaging or just filling their time with entertainment via their phone screens. It's a sad sight of the truth but those landscapes do not work after the first time.

On the other hand, if they were to use the multi level subway station concept, those tunnels could be used for advertisements. Movies trailers, product placement, and even in house promotion of dungeon instances. It is in some way a little intrusive but it catches people's attention and that is what they need. 

Of course, Jin did think of giving a virtual tour of the dungeons instances from above via the trains as well but that could be implemented on a later date when he had set up everything else. Separately, the Subway stations are a good way to isolate the dungeon instances and the System could save on processing power as well rather than show the entire island of service and dungeon instances. 

The exits would be similar to walking out from the escalator or stairs but Jin had decided that he would make it a little more…exclusive so that when the group walked out, it felt like they were the only ones who entered when in actual fact, they came together with many like minded people trying to attempt the dungeon as well. So in order to perform such a feat, groups had to be formed before they exited the subway ticket counters and as the group was going up the stairs, there would be a flicker of blinding lights when they were close to the end of the escalator, removing all the crowd that were in front of behind them. 

Only when they wish to exit the dungeon instance, they could use the emergency exit or follow the Pandamonium app to get to the nearest subway station entrance. Of course, this is based on the dungeon instance creation's implementation. For example for the Great Wall of China Dungeon, the subway station can be located near the tower but definitely not appear in the middle of the Great Wall.  I think you should take a look at

This way, the connection to old raid instances when they rotate would also be easier though the route to enter would be more or less the same. That is unless Jin had decided for an aerial entry and he would make the subway station exit platform to be floating in the skies. Only from there, the cultivators could descend to their destination. Otherwise, a suitable entrance or exit would be created to denote the start of the dungeon entrance and its endpoint.

The System found it even more systematic since the design seem to help to reduce the crowd and more importantly, it saves space. Service Instances on the other hand would be a little different compared to Dungeon Instances. They would be more crowded unless the customers decided to pay a little more for a more private experience and that's where the flicker of blinding lights will appear for them. Of course, Jin had decided to tweak it even further to have a public service instance, a semi private service instance, and a totally private service instance. (There will still be 'CCTVs' monitoring them in case of any possible police related incidents)

And that goes for the trains too. The first carriage can be catered for the more privileged groups and the rest would be for the public. Jin had also included a woman's only carriage in between in case some of the female cultivators prefer to have some peace and quiet and in order to not be sexist, Jin also did a men's only carriage. He honestly wondered how many men would like to take that instead. 

But other than that, the schematics of the subway train hub shop instance were rather simple. The first floor is where they can buy the tickets before entering or they can do that via the Pandamonium App. Stores and souvenirs would be placed on the first floor as well. And once they get to the first basement level, that would be where the latest event trains would be held. More popup stores were placed at the center of it and at both ends of the basements, will be the redemption options. Subsequently, the subway trains to the service instances would be placed in the new few levels while the dungeon trains would be further down below. 

Then the question is the pathway to all these basements. Given that Jin catered to a huge number of people, elevators would be preferred but the hassle for the number of people going to each level would be huge.

"This is another headache I got to solve before implementing the size of the platforms," Jin said to himself until he realised there might be a relic solution that could solve this.