Hi!! I'm a solo female traveller (first time travelling on my own so am pretty nervous). I'm planning to travel to both Melbourne and Sydney during my time in Australia, and I am thinking of taking a train from Melbourne's Southern Cross Station to Sydney's Central Station. (under NSW trainlink bookings - same company as with the NSW discovery pass)

I was given an 830 train from Melbourne to Sydney, and a 1950 train from Sydney to Melbourne. The train departing at 1950 will arrive in Melbourne at 0700, and is an overnight train. (Southern XPT TRAIN)

I'm not sure how safe economy class, or economy saver is, and whether I should opt for a sleeping cabin for the night train. ^ and how do the sleeper cabins work? Will i get a private compartment or will I have to share a compartment w strangers, and if so, will i be able to opt for an all female room?

Also, if anyone has any info on which parts of sydney/melbourne i should avoid safety wise, please lemme know as well! Any safety tips for solo travel in general as well would be greatly appreciated. Thanks :)