Why might publicly controlled rail operators outperform private firms?

Why might UK rail operators taken into public control be more reliable and profitable than their private predecessors?

Publicly controlled operators may avoid the heavy debt carried by some private companies, allowing the operating business to focus on running the railway.

An audience member uses UK railways to challenge the claim that private ownership is inherently more efficient, noting that operators of last resort can be more reliable and profitable. The reply offers a cautious balance-sheet explanation rather than a universal rule about ownership. Publicly controlled operators may not carry the large debts imposed on some private companies to fund other purposes. The exchange separates operational performance from financing structure and warns against treating ownership labels alone as proof of efficiency.