When enabling "Expert Mode" in the settings the following things change:
1. Safety systems (PZB, LZB and Sifa) are all enabled by default.
2. Fault Simulation is enabled.
If it is disabled the ZDE is preset to 9 18 ZL 20 to make AFB work (AFB cannot start with train data not set), but of course this data is a guess, so if you are driving a freight train with the BR 101 you should input correct data, even if Expert Mode is disabled, since otherwise AFB will perform worse (slower to react, may overshoot or undershoot the Vsoll a bit before stabilizing).
To the question of what makes the BR 101 and Bpmmbdzf cab car "Expert" if Expert Mode is disabled I would say it depends on what you mean by "Expert". If "Expert" just means "highly realistic" then I would argue that the vehicles are still Expert, even when Expert Mode is disabled since almost all of the physics and systems simulation is enabled and will impact driving characteristics. If by "Expert" you mean "more challenging than normal TSW trains" then as wunder99 stated there are a few things that make the trains more "Expert" always (regardless of setting). I will list these and some more things:
1. Batteries are simulated on all vehicles (loco, cab car, coaches) and these can discharge overtime depending on load. So you still always need to enable the ZS.
2. All switches still work and you can enable everything (even Fault Simulation) from Normal Mode, it will just take some time since you have to go into the machine room and flip switches/cutout valves.
3. AFB behaves different with regards to departing. The locomotive will cut power and reapply holding brake / Haltebremse if you do not accelerate quick enough (so usually drivers go into 100% when departing and then roll back the throttle when moving)
4. The SA/HS behälter physics and Hilfsluftspresser logic is simulated as in reality so it is possible to soft lock the locomotive in rare circumstances. Basically the HS will auto open under 4.8 bar in the SA/HS behälter, but to actually close it the pressure needs to be ~ 7.0 bar. Unfortunately the Hilfsluftspresser cannot be started (the LSS will pop open again) above 4.8 bar. This means that if the HS is open but the SA/HS pressure is maybe 5.5 bar the locomotive is "soft locked". To fix this you need to drain the SA/HS behälter with the small screw valve under the Hauptbehälter (close to the LZB/PZB absperrhahn).
This last soft lock condition is very rare both IRL and in the game. In the game all locomotives start "Running" so you would need to shut down the locomotive and drain the SA/HS behälter to get this to happen. However, I am currently (almost done) with implementing a function (controlled in the EBuLa St page) that can quickly shut down and drain the locomotive. Two options will be available:
- Normal: HB is drained a bit to 6-8 bar but all other pressures are the same as running (vorratluftsbehälter etc)
- "Long Layover": Both HB and SA/HS behälter are drained to about 4-6 bar and the vorratluftsbehälter ("R") is drained to a low pressure. In this case you can sometimes get soft locked immediately (since the SA/HS pressure can reach the "soft lock zone") so drivers will need to take the necessary steps 
Beiträge von wgreen
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Hallo zusammen,
hat schon mal jemand versucht die BR 101 in Doppeltraktion mit ZDS zu fahren? Ich bekomme das einfach nicht hin. Ich bekomme immer eine Störungsmeldung "Übertragungsfehler", den ich einfach nicht behoben bekomme. Ich habe schon in verschiedenen Reihenfolgen versucht ZDS einzuschalten, dann den Führerstand einzuschalten, komplett abgerüstet und neu aufgerüstet, ge- und entkuppelt jeweils mit ZDS an- und ausgeschalten. Es will einfach nicht funktionieren.
Hi, developer here. I had an account on this forum for several years but it got deleted due to inactivity. My German is not very good so I will answer in English
You need to open the LSS ZWS/SPS in the cab car since it will interfere with the signal between the two locos otherwise. The manual (real world) also states that drivers must open the battery in the cab car in this situation.
