The exact date and location of Mary Elizabeth Walton's birth are currently unconfirmed. However, based on the timing of her patents and societal norms of the era, it is believed she was born sometime in the 1820s or 1830s. Information about her early life, education, and upbringing is limited, though like most women of the era she likely was not given the same educational opportunities as men, thus her inventiveness is particularly noteworthy.

Walton received her first patent for a device designed to deflect smoke emitted by locomotives. This device utilized a system of water tanks and diversion structures to filter and redirect the smoke, mitigating the nuisance and health hazards it posed to urban dwellers living near railway lines. Her invention showcased an early understanding of air pollution's negative impacts and offered a practical solution.

Walton's most significant contribution came with her second patent, which represented a significant improvement on her previous smoke deflection system. This enhanced device further reduced both smoke and noise pollution generated by trains. It employed a more sophisticated system of collecting and filtering emissions, demonstrating a continuous pursuit of more effective environmental solutions. It included a number of innovations aimed at silencing the sound of train traffic in addition to improved smoke abatement.

While the immediate commercial success of Walton's inventions is difficult to ascertain due to the lack of detailed records, her patents stand as valuable examples of early efforts to address industrial pollution. Her work highlights a growing awareness of environmental concerns in the late 19th century and paved the way for future innovations in pollution control technologies. Mary Walton's story serves as an inspiration, proving that even without formal scientific training, insightful individuals could make significant contributions to technological advancement and public well-being. Her work underscores the important, but often overlooked, contributions of female inventors during this period.

Information regarding Mary Elizabeth Walton's later life and date of death is currently unavailable. Further historical research is needed to fully document her biography and contributions.