Railway requires a bank-issued credit or debit card for subscriptions. Prepaid and virtual cards are not supported.

Does Railway have a balance or wallet where I can deposit money and use it later to purchase the plan I want?

No. You'll need a valid credit card to upgrade to a paid plan. Railway doesn't offer any "deposit" solutions.

I don't have a credit card. The only card I have is a Mastercard, which I used yesterday to purchase a domain from Railway. Please help me find another way to purchase the plan I want.

Railway only supports credit cards and debit Visa cards.

Can I purchase the railway subscription with a debit card?

Visa debit, as mentioned above.

so basically railway is so high and mighty that it does not support the little guy which is most of us who can not get a traditional credit card and worse when the guy in the comments asks for solutions you double down on the situation, you minus well haVe said nothing. To me you were insulting the mans intelligence acting as if the man didnt comprehend your words. i think the lack of comprehension is in reverse and i may have chose the wrong company to run my projects through