First start of making basic shape of your vactube.













Here is list of useful models:

• vacum_entrance_a.mdl
  
• vacum_flange_a.md
  
• vactube_connectro.mdl

First start from making path_tracks. Dont forget to turn on teleprot to this path in first path track.














Now create 2 prop_dynamic_overrides, and 3 brushes in same place. Convert two of them to func_rotating and 3rd one to func_tracktrain.
Parent prop_dynamic to func_rotatating, func_rotating to 2nd func_rotating, and then to func_tracktrain. Set track train speed to 450-600, height above track to 0 and distance between the wheels to 0. Now go to flags and check allow roll (z-rot). Now open both of func_rotatings and in flags check x axis in first and y axis in 2nd. Set rotating speed to 150.

Now set 2 diffrent models to prop_dynamics_overrides. Create logic_auto and give it outputs.

Create logc_case.
Add outputs

Now in last path_track of your tube create outputs:

Create info_particle_system. Set start active to yes. Chose particle system name to bloob_curve_blue/orange/white. How place it inside the tube. Create info_target. Put it somewhere insde tube. Go to info_particle_system and set control_point_1 as info_target. Create ambient_generic inside the tube. Set sound name to world.gelflowherolp, volume to 10 and max audible distance to 1250.