Cab roof structure, cab and rail train

A cab roof structure comprising:

• a roof carline;
• at least two aluminum honeycomb panels;
• and
• at least one roof connecting beam disposed on the roof carline, comprising a roof connecting beam between every two aluminum honeycomb panels,
• wherein each aluminum honeycomb panel of every two aluminum honeycomb panels is fixedly connected to a left or right side of the roof connecting beam;
• wherein the at least two aluminum honeycomb panels comprise:
• a first aluminum honeycomb panel disposed on a left side of the roof connecting beam;
• and
• a second aluminum honeycomb panel disposed on a right side of the roof connecting beam,
• wherein the roof connecting beam comprises:
• a first protrusion provided on an upper surface of the roof connecting beam;
• a second protrusion provided on an upper end surface of the first protrusion;
• and
• a first shoulder configured to connect an upper panel of the first aluminum honeycomb panel and a second shoulder configured to connect an upper panel of the second aluminum honeycomb panel, the first and second shoulders respectively provided on left and right sides of the second protrusion and wherein bottom surfaces of bottom panels of the first and second aluminum honeycomb panels are disposed on the upper surface of the roof connecting beam.