The fact that you are pushing the train does not mean that you should neglect the side zones suitable for more thorough investigation. The entrance to one of these areas is located to the left of you. Explore the abandoned barracks to find a filter and a rifle there.
You will recognize the entrance to another optional area by the green mushrooms growing out of the wall. You must remain vigilant, as the tunnels serve as a lair of mutants. When you get close to the lair, start destroying monsters and be ready to attack from different sides. (You can camp next to the destroyed tunnel to make it easier to repel any attacks). After you finish, look for the materials and the page of Artem's diary.
Go back to your car again and start the last part of the pushing process. After he rolls along the track to the right, go to the switch and interact with him. Now you can move forward, gaining speed to drag through the wooden barricades and complete this chapter.
Use the carriage to get to Venice
First remove the gas mask, because you won't need it in this part of the tunnel. Get on the car and go straight. Use acceleration to quickly pass through areas with higher radiation. Go through another barricade to get to a small refugee camp.
I recommend that you spend some time among the refugees and listen to what they say. You can also exchange with two of them. The person left from you to understand the modifications of weapons. Barter cartridges, throwing knives, fragmentation grenades and incendiary grenades are visible on the right.
I recommend you explore further tunnels on foot because you are slowly entering areas occupied by bandits. This is because even if you turn off the lights, you will still be easily recognizable (which is even more reminiscent of the appearance of an empty car, which they do not know about, also worries them). Go straight ahead and find two skeletons on your way. As before, I recommend you to look for additional sites, so at the first opportunity, turn right and blow into the oil lamp.
Not far from here, two bandits are holding an innocent woman, so if you want to save her, you need to hurry up. Go straight ahead, get on the train and turn right. The bandits must either be shot or taken from behind and knocked unconscious. If you are late and could not save the woman, you should take into account the fact that the bandits will return to the corridor from which you originally came.
This is not the end of the problems, because one guard appears on your way, and he may be alarmed by the lack of reaction from his colleagues. I recommend waiting for this enemy near the entrance to the storeroom and knocking him down before he notices the other bandits.
Go back to the main tunnel now and carefully approach the area with two flaming railway cars where there is a large group of bandits. I recommend first smashing the lamp on the left and destroying the bandit with a gasoline canister. https://drbet.org.uk/
