A challenging campaign, totally different campaign from the old Derailed

Well, at the first glance, I took the title by mistake. There's also an old campaign with the same name so I thought this one was that same campaign being brought back. But I was wrong. It's a totally different campaign.
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In overview, this campaign is good, as during my playing twice, there's no bot navigation bug. The supplies are enough & some are scattered in explorable areas. The hints, highlights & directions are clear enough, though certain areas are still rather confusing & take some time to figure out where to go.
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Map 1 has no problem. Although there's no supply in the beginning, the medkits & weapons are scattered at some areas ahead. There's a labyrinth cave that can make some people lost, & special infected can get benefits as there are many hidden places to ambush in the labyrinth cave. The alarm event near the end of the map is quite challenging, as somehow the special infected respawn interval gets faster than usual.
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Map 2 is about cave & factory. There's no problem about the direction. However, the special infected respawn time seems faster than usual during some events.
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Map 3 takes place in prison. The alarm event in the prison is the longest in this campaign. It becomes more challenging when the special infected ones often spawn in pairs & have faster respawn time. The drawback here is probably the glow on the alarm switch. It only glows after survivors get close enough in the same room where the alarm switch is. It almost feels like playing "Hard Eight" mutation during this event, so rushing is not a good idea. Probably some players will be confused for awhile because some paths in the prison are tricky.
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Map 4 is about exploring city to go to the subway. The city area is explorable. There's also a challenge here. It's when survivors arrived at the closed subway station. After turning on the power to open the subway rolling doors, survivors have to detour to reach the subway, & during that time, there's a panic event with more frequent special infected respawn time. Oh and there's an exploitable but also buggy glitch at the finale location. Players can jump over the fence with several mounted guns even before the rescue train arrives. This can be buggy too when players jump too early before turning on the radio - they'll get stuck & have to either teleport or restart the map. The jumping location is around the stairs. Once players are successful to go behind the fence, they get benefits over special infected, as there are some mounted guns there. They only get unlucky if a tank comes from where the rescue train will come. (edited: the new version has fixed this glitch).
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Well in short, it's a good campaign to play, & more challenging than usual because of most of special infected respawn time is faster during panic & alarm events. Good to keep as collection. Probably the author would need to make the campaign name a little different, because the name would confuse players as they'll think that this is the campaign from the old time (but in fact, it's a totally new one).